package springboot.test15.interceptor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/*登录检查
* 1.配置好拦截器要拦截那些请求
* 2.把这些配置放在容器中(实现WebMvcConfigurer的addInterceptors方法)
* 3.指定拦截规则(如果是拦截所有 静态资源也会被拦截)
* */
@Slf4j
public class loginInterception implements HandlerInterceptor {
    //目标方法执行完成之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if(true){
            return true;
        }

        String requestURI = request.getRequestURI();
        log.info("拦截请求路径{}",requestURI);

        //登录检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if(true){//loginUser != null){
            //放行
            return true;
        }
        //拦截
        request.setAttribute("message","请先登录");
        request.getRequestDispatcher("/").forward(request,response);
        //session.setAttribute("message","请先登录");
        //response.sendRedirect("/");
        return false;
    }
    //目标方法执行完成之后
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
    //页面渲染完成之后
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
